Horizontal band-saw.



PATBNTED OCT. 24:, 1905.

C. G. STUAR HORIZONTAL BAND SAW.

APPLICATION FILED JAN. 22. 1903.

T. o m M I H 4 SHEETS-SHBBT 1.

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PATENTED OCT. 24, 1905.

G. 0. STUART.

HORIZONTAL BAND SAW.

APPLIOATION FILED JAN. 22. 1903.

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No. 802,667. PATENTED 001?. 24, 1905. 0. c. STUART.

HORIZONTAL BAND SAW.

APPLICATION FILED JAN. 22, 1903. 4 SHEETS SHBET 3 m mm Jnvenfor.Cllzarlca CAS iuarrf. 1g

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0. G. STUART.

HORIZONTAL BAND SAW.

APPLIUATION FILED JAN. 22. 1903.

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b STATES PATENT orrreu.

Specification of Letters Patent.

Patented Oct. 24;, 1905.

Application filed January 22,1903. Serial No. 140,186.

To all whom it 'n'tcty concern.-

Be it known that I, CHARLEs C. STUART, a citizen of the United States,residing at Campville, in the county of Lit-chfield and State ofConnecticut, have invented certain new and useful Improvements inHorizontal Band- Saws, of which the following is a specification.

This invention contemplates certain new and useful improvements insawing-machines, and relates particularly to that type employinghorizontal band-saws. Heretofore in machines of this type the materialto be operated upon has been fed from a fixed bench or table in whichare mounted feed-rolls coacting with guide-rolls, whereby the stock ismoved into contact with the saw. These feed-rolls are necessarily raisedslightly above the table in order to carry the burden of the stock anddeliver the latter to the action of the saw without being stalled by anexcess of friction between the table and the moving stock. As a resultof the excess of elevation of the feedrolls an undulatory movement isimparted to the stock in its ascent and descent over the apex of thefeed-rolls in its passage to the saw, whereby the resulting cut of thelatter is correspondingly uneven. Then again the same piece of stock ispassed over the feedrolls, these defects are repeated in an increaseddegree, the lumber thus produced being exceedingly crooked and uneven.

My invention has for its object to overcome the foregoing defects byproviding a sawingmachine with an improved feeding device whereby thestock is presented to the saw with a uniform and unvarying movement,whereupon the resultant lumber is formed with smooth, uniform, andparallel surfaces regardless of the number of cuts from a single pieceof timber.

A further object is to provide means for operating the feeding deviceand regulating the speed at which the stock is fed to the saw; and afurther object is to provide means whereby said feeding device may beadjusted to regulate the thickness of the lumber to be cut.

The invention will be hereinafter fully set forth, and particularlypointed out in the claims.

In the accompanying drawings, Figure 1 is a front elevation illustratingmy invention. Fig. 2 is a plan View thereof, showing parts in section.Fig. 3 is an end view with parts broken away and other parts shown insection. Fig. 4 is a transverse sectional view of the feed-table on linea a, Fig. 3. Fig. 5 is a detail view of the speed-regulating device.Fig. 6 is a detail view of the device for regulating the tension of thesaw.

Referring to the drawings, 1 designates a bed-plate provided at one endwith bearings 3 for a drive-shaft 4, which is rotated by a band-wheel 5,receiving power from any suitable source. (Not shown.) The drive-wheel 6is mounted upon one end of shaft 4, said drive-wheel being formed with acentral web 7 to increase the weightthereof, whereby said wheel servesthe purpose of a balance or fly wheel. The rim 8 of said wheel isprovided with a triangular peripheral depression to receive the saw 12,said saw being also passed around asecond drive-wheel 11, mounted upon ashaft 10, supported in bearings 9 at the opposite end of bed-plate 1.The bearings 9 are secured to slides 17, which are arranged toreciprocate in slots 15, formed in the bed-plate, said slots beingprovided with lateral extensions 16, whereby seats 13 are formed for thebearings 9. In order to provide for the simultaneous adjustment ofslides 17, a bracket 18 is secured to the end of bedplate 1, saidbracket being provided with bearings 19 for a rotatable shaft 20,provided at each end with a bevel-gear 24. The gears 24 mesh withcorresponding bevel-gears 23, keyed to the threaded shafts 22, mountedin bearings 21 and working in threaded recesses in slides 17. Ahand-wheel 26 is also mounted in bracket 18 and provided with a beveledpinion 25, meshing with one of the pinions 23, whereby shaft is rotatedand shafts 22 simultaneously operated to regulate the tension of the sawor to adjust the wheel 11 to saws of different lengths.

Upon bed-plate 1, intermediate of wheels 6 and 11 and to one side of thepath of the saw, is mounted a column 27, a similar column 28 (shown insection, Fig. 3) being supported at the opposite side of the path of thesaw upon a supplemental bed-plate 2, secured to bed.- plate 1. Each ofsaid columns is provided with a telescoping sleeve 29, supportingbrackets 30, provided with bearings 31 for shafts 32, the latter beingextended through slots 39 formed in the frame 34: of the feed mechanism.The side of frame 34. has been broken away at the right-hand end in Fig.3 for the purpose of illustrating slot 39 audits relation with shaft 32.Said frame is also provided with bearing-blocks 33, arranged to receiveshafts 32, said block's being secured to theexterior of frame 34 bymeans of bolts 35, working in suitable slots in said blocks. Verticalscrews I 36 are tapped into blocks 33, said screws being provided withcollars 37, bearing upon lugs 38, formed on frame 34, whereby said framemay be adjusted to a true level position or in line with the saw, slots39 permitting frame 34 to move up or down over shafts 32. Sleeves 29 areelevated by means of screw-shafts 45, working in collars 46, carried bysaid sleeves, said shafts being supported by means of bearing-collars47, resting on sleeves 48. The lower end of each shaft 45 is providedwith a beveled pinion 49, meshing with corresponding pinions on theopposite ends of a shaft 51, mounted in bearings 53 of a frame 52,carried by bed-plate 1. A spur-gear 54 is formed with one of the pinions49, the same meshing with a pinion 55 formed on a shaft 56, mounted insuitable bearings 57 and provided with a hand-wheel 58. By thisarrangement the sleeves 29 are simultaneously adjusted.

At each end of frame 34 are formed slots 40, adapted to receive andsupport flattened portions of shafts 41, upon which the channeledguide-wheels 42 for the table are mounted. Said shafts are adjustedwithin said slots by means of screws 43, passed therethrough, theirheads bearing against plates 44, secured to the ends of said frame. Inthis manner the wheels 42 are adjusted to maintain a uniform tensionupon the endless table or feeder. The latter is composed of a pluralityof plates 59 of a length equal to the Width of frame 34 and resting uponwear-plates 60, secured to said frame. Each plate 59 is provided nearits ends with depending portions, forming toothed racks or sections 61,the teeth of which are engaged by gears 62. Said toothed racks orsections work in the channels of wheels 42 and also in slots 63 of frame34, their outer faces bearing against angular extensions of thewear-plates 60. The plates 59 are united by any suitable meanspermitting of their articulated relation. The table is also held fromlateral displacement by the racks 61, working in the slots of frame 34.Thus an absolutely smooth and uniform feed is assured, which is ofdecided advantage, as a band-saw is exceedingly flexible and liable toyield. A uniform feed is therefore very essential to avoid liability offlexing the saw.

Upon the hub of driving-wheel 6 is secured a friction disk or gear 65,against which is arranged to bear a friction-wheel 66, provided with aremovable periphery 67 of a material adapted to give the requisitefrictional adhesion. Said wheel 66 is keyed to a shaft 68, but free toslide thereon, said wheel being provided with a hub 69, to which a yoke70 is secured. Said yoke is connected by links 71 with a forked lever72, mounted upon a rock-shaft 7 3, journaled in bed-plate 1, saidrock-shaft having its outer end provided with an operating-lever 7 4,whereby wheel 66 may be moved across the face of disk 65 to vary thespeed of rotation of shaft 68. The latter shaft is journaled in swiveledbearings 75 76, secured to standards 7778 by means of bolts 79. Saidstandards are arranged to be moved toward or from disk 65, their bases82 being guided by blocks 81, said bases being held in position by bolts83, passed through slots 84, formed therein and engaging the bed-plate.Fitting within standard 78 is an extension 88 of a nut 87, the latterbeing mounted upon the threaded portion 86 of a shaft 85, the threads ofsaid shaft being of such pitch as to effect a rapid movement of saidnut. Said shaft is held from endwise displacement by means of nuts 89,secured on one end thereof, the opposite end being provided with acollar 90. An operating-lever 91 is keyed on one end of said shaft, themovement of which is limited by stop 92. Keyed on shaft 68 is asprocket-wheel 93, connected by a chain 94 with a second sprocket 95,secured upon a shaft 96, journaled in bearings 97, depending from frame34. Mounted upon shaft 96 and rotating therewith is a pinion 98, meshingwith an idler 99, which in turn meshes with a pinion 100, keyed to shaft101. The latter is provided with a pinion 102, meshingwith pinion 62,whereby said latter pinions are rotated and motion is imparted to thefeed-table, as heretofore described. Adjustably secured upon columns103, located at each side of frame 34, are trammels 104, having theirfaces curved to a radius from the center of shaft 68. The dependingbearings 97 are designed to bear against these curved faces, wherebya'constant distance is maintained between shafts 68 and 96 irrespectiveof the elevation of frame 34.

Located on each side of frame 34 and at the approximate center ofbed-plate 1 are posts or'columns 105, upon which are adjustably securedhubs 106, supporting a cross-rod 107. Upon said shaft are secured twopairs of'cross-hubs 108, arranged to support two pairs of rods 109,disposed longitudinally of the frame 34 and extending beyond the path ofthe saw. Each pair of rods 109 enters a yoke 110, and adjacent each yokeare secured hubs 111, which serve to support the shafts 112 of rollers113. Intermediate of each pairof hubs 108 the rod 107 is provided withadditional hubs 114, also arranged in pairs and serving to support rods115 parallel to rods 109, but terminating short of the path of the saw.These rods also serve to support yokes 116 and the hubs 118 for theshafts 119 of rollers 120. The rollers 113 and 120 are thusindependently supported and can be readily raised or lowered and bymeans of counterweights,(not shown,) connected to'the yokes by means ofropes 121 122, can be regulated to give any desired pressure. They willalso automatically adjust themselves to an uneven surface. A stop 123 issecured to frame 34 and is provided with a gap 124. to allow the sawfree passage, and against this stop the stock abuts to resist the thrustof said saw.

The advantages of my improved sawing-machine will be readily apparent tothose skilled in the art to which it appertains. It will be particularlyobserved that I have provided simple and efficient means whereby thestock is fed to the saw with a uniform, smooth, and unvarying movement,said stock resting by gravity upon the feed-table and being evenlysupported at all points while under the action of the saw. It will alsobe noted that my improved feeding device is so arranged that the speedof the feed may be readily and quickly varied to suit varying conditionsand qualities of material. It will be further observed that thefeeding-table may be adjusted relative to the saw to regulate thethickness of the lum her to be produced and that means are provided formaintaining said feed-table in a true horizontal position, therebyinsuring accuracy in the cut of the saw. It will be further noted that Ihave provided means whereby the operation of the feed-table may bestopped independently of the operation of the saw.

I claim as my invention- 1. An improvement in sawing machines comprisingan endless feed-table, means for raising and lowering the same withrelation to the saw, and means for adjusting said table relative to thesaw independently of said former means.

2. An improvement in sawing machines comprising a frame, an endlessfeed-table carried thereby, means'for raising and lowering said framewith relation to the saw, and means for adjusting said frame relative tothe saw independently of said former means.

3. An improvement in sawingmachines comprising a frame, an endlessfeed-table carried thereby, means for raising and lowering said tablewith relation to the saw, and means for independently adjusting each endof said table.

4:. An improvement in sawing machines comprising an endless feed-table,supports therefor, means for raising and lowering said supports, andmeans for adjustably mounting said table in said supports.

5. An improvement in sawing-machines, comprising supports, a framemounted thereon and carrying an endless feed-table, means for adjustingsaid frame in said supports, and means for raising and lowering saidsupports.

6. An improvement in sawing-machines, comprising supporting brackets,shafts mounted therein, a frame supported by said shafts and carrying anendless feed-table, and means for adj usting the relative height ofsaid. shafts.

7. An improvement in sawing-machines, comprising supporting brackets,shafts mounted therein, a frame, adjustable blocks carried thereby andconstructed to receive the ends of said shafts, and an endlessfeed-table carried by said frame.

8. An improvement in sawing-machines, comprising supporting brackets,shafts mounted therein, a frame, adjustable blocks carried thereby andconstructed to receive the ends of said shafts, adjustingscrews for saidblocks, and an endless feed-table carried by said frame.

9. An improvement in sawing-machines, comprising telescoping supportscarrying brackets, shafts mounted in said brackets, a frame adjustablymounted on said shafts and carrying an endless feed-table, and means forexpanding or contracting said telescoping supports, whereby said frameis raised or lowered.

In testimony whereofI aflix my signature in presence of two witnesses.

CHARLES C. STUART.

Witn esses:

RANsoM C. l/VRIeH'r, l/VILLIAM C. STOEVER.

